Cooktop



FIG. 1 is a front perspective view of a cooktop showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view thereof.

The broken line showing of the knobs, the graphics on the top of the cooktop, and the remainder of the cooktop is for environmental purposes only and forms no part of the claimed design. 

CLAIM The ornamental design for a cooktop, as shown and described. 